519
FNCA52 TJSJ 140730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST TUE JUL 14 2026
DISCUSSION
A DRY AIR MASS AND SAHARAN DUST WILL CONTINUE TO DOMINATE THE
REGION TODAY, KEEPING THE FIRE DANGER RISK ELEVATED. THIS DRY
WEATHER PATTERN WILL CAUSE RELATIVE HUMIDITY (RH) LEVELS TO DROP
TO CRITICAL THRESHOLD VALUES BETWEEN 40% AND THE LOW 50S DURING
THE EARLY AFTERNOON HOURS. IN ADDITION TO THE LOW HUMIDITY, WINDS
WILL BE FAVORABLE FOR RAPID FIRE SPREAD, BLOWING FROM THE EAST-
SOUTHEAST AT 10 TO 15 MPH WITH HIGHER GUSTS.
BECAUSE OF THESE CRITICAL CONDITIONS, A FIRE DANGER STATEMENT HAS
BEEN ISSUED FOR MOST SECTIONS OF THE SOUTHERN PLAINS AND ACROSS
THE NORTHERN COASTAL SECTORS OF THE ISLAND. ANY FIRES THAT IGNITE
IN THESE AREAS COULD SPREAD QUICKLY AND BECOME DIFFICULT TO
CONTROL. ADDITIONAL RED FLAG WARNING CONDITIONS ARE BRIEFLY
POSSIBLE; HOWEVER, THE LIMITING FACTOR WILL BE THE SOUTH WIND
COMPONENT THAT CAN TRIGGER CHANGES IN THE RH VALUES.
PRZ014-142000-
SOUTHEAST COASTAL PLAINS-
330 AM AST TUE JUL 14 2026
TODAY TONIGHT WED
CLOUD COVER CLEAR CLEAR CLEAR
PRECIP TYPE NONE NONE NONE
CHANCE PRECIP (%) 0 0 0
TEMP (24H TREND) 92 (+1) 74 (-3) 94
RH % (24H TREND) 43 (-10) 85 (+3) 41
WIND 20FT/EARLY(MPH) E 16 E 16 E 17
WIND 20FT/LATE(MPH) E 18 E 12 E 19
MIXING HGT(FT-AGL/MSL)4760 5120
TRANSPORT WND (MPH) E 18 E 18
VENT RATE (KT-FT) 76160 81920
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-142000-
SOUTHERN HILLS-
330 AM AST TUE JUL 14 2026
TODAY TONIGHT WED
CLOUD COVER MCLEAR CLEAR MCLEAR
PRECIP TYPE SHOWERS NONE NONE
CHANCE PRECIP (%) 0 0 0
TEMP (24H TREND) 90 (+4) 70 (-4) 90
RH % (24H TREND) 55 (-11) 96 (+5) 54
WIND 20FT/EARLY(MPH) E 12 E 13 E 13
WIND 20FT/LATE(MPH) E 14 E 13 E 14
MIXING HGT(FT-AGL/MSL)4980 5470
TRANSPORT WND (MPH) E 17 E 15
VENT RATE (KT-FT) 74700 71110
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-142000-
NORTH COASTAL PLAINS-
330 AM AST TUE JUL 14 2026
TODAY TONIGHT WED
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 0 0 0
TEMP (24H TREND) 91 (+1) 73 (-3) 91
RH % (24H TREND) 57 (-10) 95 (+3) 57
WIND 20FT/EARLY(MPH) E 16 E 21 E 16
WIND 20FT/LATE(MPH) E 24 E 12 E 21
MIXING HGT(FT-AGL/MSL)4850 4920
TRANSPORT WND (MPH) E 20 E 17
VENT RATE (KT-FT) 82450 73800
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-142000-
NORTHERN HILLS-
330 AM AST TUE JUL 14 2026
TODAY TONIGHT WED
CLOUD COVER MCLEAR CLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 20 0 10
TEMP (24H TREND) 91 (+3) 71 (-3) 90
RH % (24H TREND) 59 (-8) 96 (+1) 58
WIND 20FT/EARLY(MPH) E 13 E 18 E 14
WIND 20FT/LATE(MPH) NE 20 E 10 E 18
MIXING HGT(FT-AGL/MSL)5750 5700
TRANSPORT WND (MPH) E 15 E 14
VENT RATE (KT-FT) 74750 68400
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-142000-
WEST COAST-
330 AM AST TUE JUL 14 2026
TODAY TONIGHT WED
CLOUD COVER MCLEAR CLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 30 0 30
TEMP (24H TREND) 93 (+1) 73 (-2) 93
RH % (24H TREND) 57 (-8) 96 (+3) 56
WIND 20FT/EARLY(MPH) E 14 E 14 E 14
WIND 20FT/LATE(MPH) E 14 E 11 E 14
MIXING HGT(FT-AGL/MSL)4740 5280
TRANSPORT WND (MPH) E 13 E 9
VENT RATE (KT-FT) 52140 42240
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-142000-
EASTERN INTERIOR-
330 AM AST TUE JUL 14 2026
TODAY TONIGHT WED
CLOUD COVER CLEAR MCLEAR CLEAR
PRECIP TYPE NONE SHOWERS NONE
CHANCE PRECIP (%) 0 10 0
TEMP (24H TREND) 90 (+2) 72 (-3) 90
RH % (24H TREND) 57 (-9) 97 (+4) 56
WIND 20FT/EARLY(MPH) E 13 E 14 E 12
WIND 20FT/LATE(MPH) E 14 E 14 E 14
MIXING HGT(FT-AGL/MSL)5360 5690
TRANSPORT WND (MPH) E 17 E 15
VENT RATE (KT-FT) 80400 73970
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-142000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST TUE JUL 14 2026
TODAY TONIGHT WED
CLOUD COVER CLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS SHOWERS
CHANCE PRECIP (%) 0 10 10
TEMP (24H TREND) 85 (+4) 70 (-3) 84
RH % (24H TREND) 65 (-12) 100 (+3) 65
WIND 20FT/EARLY(MPH) E 12 E 12 E 11
WIND 20FT/LATE(MPH) E 13 E 12 E 12
MIXING HGT(FT-AGL/MSL)4610 4900
TRANSPORT WND (MPH) E 18 E 15
VENT RATE (KT-FT) 73760 63700
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-142000-
CENTRAL MOUNTAIN RANGE-
330 AM AST TUE JUL 14 2026
TODAY TONIGHT WED
CLOUD COVER MCLEAR CLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 20 0 30
TEMP (24H TREND) 89 (+5) 67 (-4) 89
RH % (24H TREND) 60 (-11) 98 (+3) 59
WIND 20FT/EARLY(MPH) E 10 E 10 E 10
WIND 20FT/LATE(MPH) E 11 E 9 E 11
MIXING HGT(FT-AGL/MSL)6880 7370
TRANSPORT WND (MPH) E 12 E 9
VENT RATE (KT-FT) 68800 58960
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-142000-
CAYEY MOUNTAIN RANGE-
330 AM AST TUE JUL 14 2026
TODAY TONIGHT WED
CLOUD COVER CLEAR CLEAR CLEAR
PRECIP TYPE NONE NONE NONE
CHANCE PRECIP (%) 0 0 0
TEMP (24H TREND) 85 (+2) 70 (-3) 85
RH % (24H TREND) 64 (-9) 100 (+2) 62
WIND 20FT/EARLY(MPH) E 11 E 12 E 11
WIND 20FT/LATE(MPH) E 13 E 12 E 13
MIXING HGT(FT-AGL/MSL)4730 4940
TRANSPORT WND (MPH) E 18 E 16
VENT RATE (KT-FT) 75680 69160
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-142000-
VIEQUES-
330 AM AST TUE JUL 14 2026
TODAY TONIGHT WED
CLOUD COVER CLEAR MCLEAR CLEAR
PRECIP TYPE NONE SHOWERS NONE
CHANCE PRECIP (%) 0 10 0
TEMP (24H TREND) 89 (+1) 77 (-2) 89
RH % (24H TREND) 58 (-7) 86 (0) 57
WIND 20FT/EARLY(MPH) E 16 E 18 E 14
WIND 20FT/LATE(MPH) E 17 E 18 E 14
MIXING HGT(FT-AGL/MSL)3980 4220
TRANSPORT WND (MPH) E 21 E 18
VENT RATE (KT-FT) 71640 67520
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-142000-
CULEBRA-
330 AM AST TUE JUL 14 2026
TODAY TONIGHT WED
CLOUD COVER CLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS SHOWERS
CHANCE PRECIP (%) 0 10 10
TEMP (24H TREND) 91 (+3) 78 (-2) 90
RH % (24H TREND) 58 (-11) 89 (+3) 57
WIND 20FT/EARLY(MPH) E 16 E 17 E 14
WIND 20FT/LATE(MPH) E 16 E 17 E 14
MIXING HGT(FT-AGL/MSL)4010 4140
TRANSPORT WND (MPH) E 21 E 20
VENT RATE (KT-FT) 72180 70380
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-142000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST TUE JUL 14 2026
TODAY TONIGHT WED
CLOUD COVER MCLEAR CLEAR MCLEAR
PRECIP TYPE NONE NONE NONE
CHANCE PRECIP (%) 0 0 0
TEMP (24H TREND) 93 (+2) 75 (-2) 93
RH % (24H TREND) 45 (-9) 84 (+3) 44
WIND 20FT/EARLY(MPH) E 19 E 20 E 19
WIND 20FT/LATE(MPH) SE 21 E 16 E 20
MIXING HGT(FT-AGL/MSL)4570 4940
TRANSPORT WND (MPH) E 21 E 16
VENT RATE (KT-FT) 82260 69160
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-142000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST TUE JUL 14 2026
TODAY TONIGHT WED
CLOUD COVER CLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS NONE
CHANCE PRECIP (%) 0 10 0
TEMP (24H TREND) 88 (+2) 77 (-2) 88
RH % (24H TREND) 62 (-9) 89 (+2) 61
WIND 20FT/EARLY(MPH) E 17 E 18 E 16
WIND 20FT/LATE(MPH) E 16 E 18 E 16
MIXING HGT(FT-AGL/MSL)4090 4230
TRANSPORT WND (MPH) E 22 E 16
VENT RATE (KT-FT) 77710 59220
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-142000-
ST CROIX-
330 AM AST TUE JUL 14 2026
TODAY TONIGHT WED
CLOUD COVER CLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS NONE
CHANCE PRECIP (%) 0 10 0
TEMP (24H TREND) 89 (+2) 77 (-2) 89
RH % (24H TREND) 61 (-8) 88 (0) 61
WIND 20FT/EARLY(MPH) E 17 E 17 E 14
WIND 20FT/LATE(MPH) E 16 E 17 E 16
MIXING HGT(FT-AGL/MSL)4550 5370
TRANSPORT WND (MPH) E 22 E 20
VENT RATE (KT-FT) 86450 91290
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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